气候变化领域集成服务门户(CCPortal): Reef shallowing is a critical control on benthic foraminiferal assemblage composition on nearshore turbid coral reefs

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DOI	10.1016/j.palaeo.2019.109240
	Reef shallowing is a critical control on benthic foraminiferal assemblage composition on nearshore turbid coral reefs
	Johnson J.A.; Perry C.T.; Smithers S.G.; Morgan K.M.; Woodroffe S.A.
发表日期	2019
ISSN	0031-0182
卷号	533
英文摘要	Declining water quality represents a major threat to the coral reefs of Australia's Great Barrier Reef (GBR). Due to their close proximity to river point sources, reefs situated on the inner-shelf of the GBR are widely perceived to be most susceptible to the increased discharge of nutrients and sediments from coastal catchments, many of which have been modified since European settlement. However, the impact and magnitude of water quality change on the GBR's inner-shelf reefs remains unclear. Much of the uncertainty can be attributed to a paucity of long-term records with which to assess ecological and environmental change over appropriate reef-building timescales. Here, we present benthic foraminiferal palaeo-records from three proximal nearshore turbid-zone reefs located within the central region of the GBR. Bayesian age-depth modelling was used to identify the core intervals corresponding to the timing of European settlement in the region (c. 1850 CE), enabling the investigation of: (1) the composition and variability of benthic foraminiferal assemblages during reef shallowing towards sea level; and (2) whether any signal of increased nutrient and sediment inputs, as the result of historical land-use change, can be discerned on the most nearshore reefs of the central GBR. Multivariate analyses identified two assemblage groups, delineated by a significant increase in the relative abundance of Pararotalia spp. up-core. Our results suggest that post-European settlement associated increases in nutrient and sediment inputs are unlikely to have driven the observed shifts in benthic foraminiferal assemblage composition. Rather, we interpret changes in the composition of benthic foraminiferal assemblages as being linked to changes in hydrodynamic energy, light availability and the carbonate content of reef-matrix sediments during reef shallowing towards sea level. Our findings support the hypothesis that nearshore turbid-zone reefs have a higher resistance to increased nutrient and sediment inputs than those located further offshore, towards the inner/mid-shelf boundary of the GBR. © 2019 The Authors
英文关键词	European settlement; FoRAM Index; Great Barrier Reef; Pararotalia spp.; Terrigenous sediment; Water quality
语种	英语
scopus关键词	benthic environment; benthic foraminifera; biostratigraphy; carbonate sediment; community composition; coral reef; light availability; paleobiology; shallow water; terrigenous deposit; turbidity; water quality; Australia; Coral Sea; Great Barrier Reef; Queensland; Anthozoa; Pararotalia
来源期刊	Palaeogeography, Palaeoclimatology, Palaeoecology
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/150820
作者单位	School of Geography, College of Life and Environmental Sciences, University of Exeter, Exeter, EX4 4RJ, United Kingdom; College of Science and Engineering, James Cook University, Townsville, QLD 4811, Australia; Asian School of the Environment, Nanyang Technological University, Singapore, 639798, Singapore; Department of Geography, Durham University, Lower Mountjoy, South Road, Durham, DH1 3LE, United Kingdom
推荐引用方式 GB/T 7714	Johnson J.A.,Perry C.T.,Smithers S.G.,et al. Reef shallowing is a critical control on benthic foraminiferal assemblage composition on nearshore turbid coral reefs[J],2019,533.
APA	Johnson J.A.,Perry C.T.,Smithers S.G.,Morgan K.M.,&Woodroffe S.A..(2019).Reef shallowing is a critical control on benthic foraminiferal assemblage composition on nearshore turbid coral reefs.Palaeogeography, Palaeoclimatology, Palaeoecology,533.
MLA	Johnson J.A.,et al."Reef shallowing is a critical control on benthic foraminiferal assemblage composition on nearshore turbid coral reefs".Palaeogeography, Palaeoclimatology, Palaeoecology 533(2019).